I've been thinking about one of those chinese Oranges, too.
I'd say Dual Terror because 2 channels are better than one.
Are you thinking about a combo or a head?
If this is the latter, you might consider this one instead:
I have a tiny terror combo and it gets very heavy distortion with the onboard gain. I have ran a couple pedals with mine. I think they are great sounding amps. I haven't tried the dark but you can play metal with a regular terror so it must be crazy.
Do you have any demo of your tt?